Home / 20,861.50-28,788.78-11,429.86

Finding the Fourth Proportional to 20,861.50, 28,788.78 and 11,429.86

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Solution

The fourth proportional to 20,861.50, 28,788.78 and 11,429.86 is: 15,773.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.50 : 28,788.78 = 11,429.86 : x
  2. Step 2: Convert to fraction form
    20,861.50/28,788.78 = 11,429.86/x
  3. Step 3: Cross multiply
    20,861.50x = 28,788.78 × 11,429.86
  4. Step 4: Simplify right side
    20,861.50x = 329,051,724.97
  5. Step 5: Solve for x
    x = 329,051,724.97/20,861.50
  6. Step 6: Final answer
    x = 15,773.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.